/*
Copyright 2022 Huawei Cloud Computing Technologies Co., Ltd.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package immutable

import (
	"sync/atomic"

	"github.com/openGemini/openGemini/engine/comm"
	"github.com/openGemini/openGemini/lib/bufferpool"
	"github.com/openGemini/openGemini/lib/encoding"
	"github.com/openGemini/openGemini/lib/fileops"
	"github.com/openGemini/openGemini/lib/record"
	"github.com/openGemini/openGemini/lib/tracing"
	"github.com/openGemini/openGemini/lib/util"
)

type ReadContext struct {
	coderCtx       *encoding.CoderContext
	preAggBuilders *PreAggBuilders
	decBuf         []byte
	offset         []uint32
	col            record.ColVal

	ops             []*comm.CallOption
	tr              util.TimeRange
	Ascending       bool
	onlyFirstOrLast bool
	origData        []byte

	readBuf []byte

	readSpan     *tracing.Span
	filterSpan   *tracing.Span
	closedSignal *int32
}

func NewReadContext(ascending bool) *ReadContext {
	var readBuf []byte
	if !fileops.MmapEn {
		readBuf = bufferpool.Get()
	}
	b := bufferpool.Get()
	return &ReadContext{
		coderCtx:       encoding.NewCoderContext(),
		preAggBuilders: newPreAggBuilders(),
		decBuf:         b[:0],
		Ascending:      ascending,
		tr:             record.MinMaxTimeRange,
		readBuf:        readBuf,
	}
}

func (d *ReadContext) SetClosedSignal(s *int32) {
	d.closedSignal = s
}

func (d *ReadContext) isAborted() bool {
	if d.closedSignal == nil {
		return false
	}
	return atomic.LoadInt32(d.closedSignal) > 0
}

func (d *ReadContext) SetSpan(readSpan, filterSpan *tracing.Span) {
	d.readSpan = readSpan
	d.filterSpan = filterSpan
}

func (d *ReadContext) GetOps() []*comm.CallOption {
	return d.ops
}

func (d *ReadContext) SetOps(c []*comm.CallOption) {
	d.ops = c
}

func (d *ReadContext) MatchPreAgg() bool {
	return len(d.ops) > 0
}

func (d *ReadContext) Set(ascending bool, tr util.TimeRange, onlyFirstOrLast bool, ops []*comm.CallOption) {
	d.Ascending = ascending
	d.tr = tr
	d.onlyFirstOrLast = onlyFirstOrLast
	d.ops = ops
}

func (d *ReadContext) Reset() {}

func (d *ReadContext) Release() {
	if d.coderCtx != nil {
		d.coderCtx.Release()
		d.coderCtx = nil
	}

	if d.decBuf != nil {
		d.decBuf = d.decBuf[:0]
		bufferpool.Put(d.decBuf)
		d.decBuf = nil
	}

	if d.preAggBuilders != nil {
		d.preAggBuilders.Release()
		d.preAggBuilders = nil
	}

	if d.readBuf != nil {
		bufferpool.Put(d.readBuf)
		d.readBuf = nil
	}
}

func (d *ReadContext) SetTr(tr util.TimeRange) {
	d.tr = tr
}

func (d *ReadContext) InitPreAggBuilder() {
	d.preAggBuilders = newPreAggBuilders()
}

func (d *ReadContext) GetReadBuff() []byte {
	return d.readBuf
}

func (d *ReadContext) GetCoder() *encoding.CoderContext {
	return d.coderCtx
}
